Cynaps Classic Bluetooth Bone Conduction Cap with Removable Module - Available in Black, Grey and Stealth

Take calls and listen to music through vibration, leaving your ears free to hear your surroundings. Caps are sweat absorbing, keeping you cool and dry all day. It's easy to remove the electronics to wash the cap, or to re-install them into any hat, helmet or hardhat. Battery life: Over 8 hours of continuous audio listening on average volume (varies by volume level) Maximum volume output: 85dB Charging time: around 1 hour Bluetooth Version: 4.2